There is a waterfall not far from the Hamilton Greenbelt trailhead. When the water is not flowing too strong, you can climb out on the edge and watch the fish swimming below, beneath the ferns and a few scattered wildflowers.
The Hamilton Greenbelt in Lakeway is a pleasant place to hike. I went in maybe two miles, got turned around, and then followed the sun on the way back to the trailhead. I’m looking forward to exploring this area further.